Ensured that <stdnoreturn.h> defines a _Noreturn no-op macro when compiling with a C99 compiler instead of a C11 compiler.
Ensured that <stdnoreturn.h> defines a _Noreturn no-op macro when
compiling with a C99 compiler instead of a C11 compiler.

dryc/libc11,ZakharBondia/libc11,ZakharBondia/libc11,dryc/libc11,dryproject/libc11,dryproject/libc11,dryproject/libc11,dryc/libc11,ZakharBondia/libc11